单项选择题

One　use　of　networks　is　to　let　several　computers　share______such　as　file　systems,　printers,　and　tape　drives.

A．CPU
B．memory
C．resources
D．data
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Certain keywords or phrases in a hypertext document are linked to other online documents through(75).
A．hyperlinks
B．references
C．transports
D．containments
单项选择题
When the result of an operation becomes larger than the limits of the representation，(79) occurs．
A．overexposure
B．overdraft
C．overflow
D．overdose
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